PRRT2 deficiency induces paroxysmal kinesigenic dyskinesia by regulating synaptic transmission in cerebellum.

PRRT2 deficiency induces paroxysmal kinesigenic dyskinesia by regulating synaptic transmission in cerebellum.
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PRRT2缺陷通过调节小脑突触传递诱发阵发性运动性运动障碍

DOI:
10.1038/cr.2017.128
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发表时间:
2018-01
期刊:
影响因子:
44.1
通讯作者:
Xiong ZQ
Xiong ZQ
中科院分区:
生物学1区
文献类型:
--
作者:
Tan GH;Liu YY;Wang L;Li K;Zhang ZQ;Li HF;Yang ZF;Li Y;Li D;Wu MY;Yu CL;Long JJ;Chen RC;Li LX;Yin LP;Liu JW;Cheng XW;Shen Q;Shu YS;Sakimura K;Liao LJ;Wu ZY;Xiong ZQ

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富含脯氨酸的跨膜蛋白2(PRRT 2)的突变与阵发性运动诱发性运动障碍(PKD)和其他几种阵发性神经系统疾病有关,但PRRT 2的功能和致病机制仍然很不清楚。在这里,我们表明PRRT2是一种突触前蛋白,与SNARE复合物的组分相互作用,并下调其形成。功能丧失突变小鼠表现出PKD样表型,由全身性癫痫发作、高热或小脑的光遗传学刺激触发。在小脑颗粒细胞(GC)中具有特异性PRRT 2缺失的突变小鼠概括了在Prrt 2缺失小鼠中观察到的行为表型。此外,在小脑切片中进行的记录表明,GC的光遗传学刺激导致短暂升高,随后抑制浦肯野细胞放电。用于PKD治疗的抗惊厥药物卡马西平也减轻了突变小鼠的PKD样行为。总之,我们的研究结果将PRRT 2确定为SNARE复合物的新型调节剂,并提供了PRRT 2相关行为的电路机制。
Mutations in the proline-rich transmembrane protein 2 (PRRT2) are associated with paroxysmal kinesigenic dyskinesia (PKD) and several other paroxysmal neurological diseases, but the PRRT2 function and pathogenic mechanisms remain largely obscure. Here we show that PRRT2 is a presynaptic protein that interacts with components of the SNARE complex and downregulates its formation. Loss-of-function mutant mice showed PKD-like phenotypes triggered by generalized seizures, hyperthermia, or optogenetic stimulation of the cerebellum. Mutant mice with specific PRRT2 deletion in cerebellar granule cells (GCs) recapitulate the behavioral phenotypes seen in Prrt2-null mice. Furthermore, recording made in cerebellar slices showed that optogenetic stimulation of GCs results in transient elevation followed by suppression of Purkinje cell firing. The anticonvulsant drug carbamazepine used in PKD treatment also relieved PKD-like behaviors in mutant mice. Together, our findings identify PRRT2 as a novel regulator of the SNARE complex and provide a circuit mechanism underlying the PRRT2-related behaviors.
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